Helium Calibration Gas

PORTACAL® Helium calibration gas. Helium (HE) is a colorless nonreactive gas that is less dense that air. Helium has many applications. Helium is a gas shield for arc welding, a protective gas in growing silicon and germanium crystals and producing titanium and zirconium, for pressuring liquid fuel rockets, for use in magnetic resonance imaging (MRI), as a cooling medium for nuclear reactors, and as a gas for supersonic wind tunnels. A mixture of helium and oxygen is used as an artificial atmosphere for divers and others working under pressure. Helium is used for filling balloons and blimps.